Tack-pulling machine.



F. L, MAOKBNZIE. TACK PULLING MACHINE. APPLICATION FILED JAN. 11, 1911.

Patented Sept. 1, 1914.

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It'll: AURRIS PETERS CO. F'Hom- T HQ. WASHINGTON D P. L. MAQKENZIE.

TAGK PULLING MACHINE. APPLIGATION FILED 11111.11, 1911.

1,109,238, I Patented Sept. 1, 1914.

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r nnn L. MACKENZIE, or BEVERLY, mnssacnusnr'rs, A ss'IGNon rofunrrnn SHOE maonrnnnrcorrranv, or rarnnson, New JEnsEY ri CORPORATION OF NEW JERSEY. 1'

TAcK-rULLine MACHINE.

Specification of Letters Patent;

Patented Sept. 191 1.

. .App1icationfi1f3d-Tanuary 11, 1911; Seria1No.601,9. I c

To aZZ'whom it may concern: 7

Be it known that I, FRED L. MAcKENzm, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Tack-pulling Machines; and I do hereby declare the following to be a full, clear, and exact descrip tion of the invention, such as will enable 10 others skilled in the art to which it apper tains to make, and use the same.

The present invention relates to tackpulling machines, and more particularly to machines employed for removing the lasting tacks from a shoe prior to the sewing operal tion. w Machines of this general character are 1 provided with tackpulling jawswhich are advanced into a tack engaging position to engage thehead of the tack, and then are retracted in aninclin'ed plane to cpull the tack. Thejaws are supported to move toward and from one another" and means are provided for moving the jaws-to engage and release the tack at proper-intervals.

,The object of the present invention is to improve the construction and mode of operation of machines of this type lVith this object in view a featureof the invention contemplates the provision of a rotary cam for actuating the tack pulling jaws provided a with working faces which are normal ,at

their point of operation to the inclined plane in which thejaws are retracted and which are inclined to theaxis of the .cam. l

., -A further feature of the invention comprises a pluralityof slideswhich are adapted'to move substantially at right angles to the faces of the cam for imparting an ad vancing and retracting movement to the lawaand an auxiliary Slidewhioh isslidinglysupported in one ofthe first mentioned slides and operated by the same camto impart an oscillatory movement to one of-the .j aws.

, Other features of theinvention comprise certain novel constructions and. arrangements 1of -parts hereinafter described, and claimed, the advantages of which will be obvious to those skilled in the art. I 1

In the drawingsillustrating the preferred form of the invention Figure 1 represents a. .side elevation of the improved tackl'pulling machine, with certain parts. of the machine cutaway and shown section Fig. 2'' is,

an end elevation of the machine looking at the same fromthe front. .Fig. 3 is a detail showing an elevation of the operating mechanism for one of the jaws. Figs. l. and 5 are detail views illustrating the mode of operation of-the jaws and Fig. 6is a diagram matic illustration of'the path of movement of the tackengaging ends of the jaws.

The/present machine is designed as an mprovement upon the machine illustrated in the application for United States letters patent of Hadaway, No. 498,238, filed May 25,1909. g a

the illustrated embodiment of the invention the tack pulling devices consist of twortaok-pulling jaws land 2, which are moved'toward and from the work in engagingcand pulling a tack. The work is supported during thepulling operation by en-. gagement with 'a work support 3 against which the shoe is held by the operator. i j

The machine is also provided with a second work support'or guard l arranged to engage the upper on the inner side of the row of lastingtacks. The work support 3 is attached to theouter end of a throat 6 which projects integrally from the machine frame 7 and the'work support and throat together form apassage-Way or a chute through which the tacks may be discharged. The-guard or, worksupportt {is provided with'a projecting finger 8, shownin- Fig. 2, which engages the lower front edge of the work support 8 and forms'a tack engaging stopat the outer end of the throat between the adjacent edges of "the work supports throughwhich the'tackis guided into position to be acted .upon by the tack'pulling jaws. The guard or'work support 4: is adjustably securedto the end of a supporting arm9 so that it maybe properly adjusted with relation to the work support 3 and the ends of the jaws when they are in tackengagingposition. The shoe is presented to the machine with the line of lastingtacks extendingparallel with the tack engagingedge's of the tack pulling jaws so thatthe work supports 3 andL bear upon'the upper on both sides of theline of tacks as the tacksare' brought successively into position tobe: engaged by the jaws. In operating'upon the tacks, the tack pulling jaws are advanced-until the tackengaging ends project into,or slightly beyond, theiplane of the upper when held.

against the work supports 3 and 4: and are then closed to engage the opposite sides of I the tack, and are then retractedrto withdraw the tack from the shoe, the aws being again opened or separated before or during the next succeeding advance movement toward the upper. After the tack pulling jaws have been retracted to withdraw the tack from the shoe, a relative movement is imparted to the jaws to forcibly eject the tacks carried therebjn In the construction shown, the upward movement of the jaw 1 ceases after the tack has been pulled, while the "upward movement of the jawu2 is continued. This up ward movement of the aw 2, with relation to the jaw 1, carries the tack up along the front face of a shoulder 10 formed upon the jaw 1 until the tack passes the upper edge of the shoulder when the pressure on the rear-side of the tack being thus removed, it is ejected to the rear, as indicated clearly in Fig. 5. After the tack has been ejected, the jaws are separated or opened and are again advanced so thatgthey are brought simultaneously into tack engaging position and are-simultaneously engaged with the,

tack and retracted. The path of movement of the tack engaging jaws isindicated clearly in Fig. 6. v

It is customary in machines of this character, in order that the lasting tacks may be properly pulled, toretract the jaws in an inclined path, and in the preferred embodiment of the invention this is accomplished by supporting the aws' upon a plurality of slides which are caused to move parallel to the line of retraction of the jaws. In order that the jaws may be opened and closed, they are supported for oscillatory movement upon the slides. A single cam operates the slides to-advance and retract the jaws and also imparts an oscillatory movement to one of the jaws, and a second cam is pro vided to oscillate the other jaw through suitable connections. This produces an eX- tremely simple and 'eflicient method of imparting the proper movement to the jaws and with a relatively small number of,

parts. In order to accomplish this end, the jaw 1 is pivotally supported upon the lower end of a slide 11 and the jaw 2 is pivotally supported upon the lower end of a slide12.

The slides 11 and 12 are slidingly mounted; in guideways formed in the opposite faces of a block 13 whichis fixed tothe machine frame inan inclined position in order that the slides shall move parallel to the jaws when the latter are retracted. The slides are retained in their respective guideways by a plurality of cover plates 141- fastened to the opposite faces of the block 13 and all wear upon the slides and guideways is taken up by wear plates 15 which arcade .j'ustedb'y 'a plurality of-adjusting screws 16.-

block from turning relatively to the machine frame.

In order to provide for an adjustment of the jaw 1 to and from the work supports, it is adjustably mounted in a holder 18 which is formed as a bell-crank lever and is pivoted to the slide'll at 19. The jaw 2 is also adjustably mounted! in a holder 20 which is'in the form of a curved lever plvoted upon the slide 12 centrally at 21. The slides 11 and 12 are reciprocated to advance and retract the jaws and at the same time oscillatory movements are imparted to the holders 18 and 20 in order to; open and close the jaws. The slides are reciprocated at the proper time by a cam 23 which-is mounted upon the main driving shaft 24L j ournaledhorizontally in the upper portion of the machine frame.

It will be noted that the planes in which the slides are retracted are inclined to the axis of the cam 23 and in order to reciprocate the slides in the most efiicient manner, it is essential that theworking faces of the cam be normal at their respective points of operation to the planes in which the slides move. In the preferred embodiment of the invention, the cam 23 is provided with a plurality of cam grooves, the sides of which are normal at their points of operation to the path of movement of the slides and may aptlybe termed the working faces of the cam. In order to enable the slides to move 1n close proximity to the respectlve workmg faces of the cam, the cam 23 is provided with theoconical faces 26 and 27 which are parallel to the plane in which the jaws are recam roll 32 which engages with the cam groove 28 and the slide 12 is provided with the cam roll 33 whichengages with the cam groove 30 in order to advance and retract the jaws at the proper intervals. The'cam 23 is also conveniently employed for imparting an oscillatory movement to the jaw 1 and for this purpose an auxiliary slide 34 is employed which is slidingly mounted'in guideways formed in the slide 12. The slide 34: is connected to one arm of the holder 18 by a link 35 and is reciprocated relatively to the slide 12 by the cam groove 29 which is operatively connected to the slide by means ofaroll'37. An oscillatory movement is imparted to the jaw 2 by a cam 38 mounted upon the'drive shaft 24:. The cam 38 is provided with'a cam groove '39 which engages with a camroll 40 mounted upon the. upper end of a lever il. The lever 41 is pivoted centrally upon an arm 42 projecting laterally from the machine frame and is connected at its lower end to the upper end of the holder by means of a link 48.

While it is preferred to employ the specific construction and arrangement of parts shown and described, it will be understood that this construction and arrangement may be changed and modified without departing from the broader features of the invention.

What is claimed is 1. A tack pulling machine, comprising a work support, a pair of tack pulling jaws,

. means for advancing and retracting the jaws comprising a rotary cam provided with working faces which are normal at their point of operation to the plane in which the jaws are retracted, a plurality of'slides supporting the jaws and adapted to move parallel to the said lane, and operative connections between the cam and slides, substantially as described. j

2. A tack pulling machine, having, in combination, a work support, a pair of tack pulling jaws, means for advancing and retracting the jaws comprising a rotary cam having a plurality of conical faces parallel to the plane in which the jaws are retracted, cam grooves formed in the conical faces and having theirworking faces normal to the plane at their points of operation and operative connections between the cam and jaws, substantially as described.

3. A tack pulling machine, having, in combination, a work support, a pair of tack pulling jaws, a slide supporting each jaw,

a rotary cam adapted to reciprocate the rotary cam to oscillate one of the jaws, and

a second rotary cam operatively connected to the second jaw andzadapted to oscillate it at the proper intervals to open and close the jaws, substantially as described.

4. A. tack pulling machine comprising a pair of jaws having 'a tack pulling movement in an inclined plane, a slide carrying each jaw and moving parallel to the plane of the tack pulling movement, and a single rotary cam for imparting a tack pulling movement to both jaws, substantially as described.

5. A tack pulling machine comprising'a tack pulling tool, a drive shaft, a rotary cam mounted thereon havin a face arranged obliquely to the drive s aft and pro-v vided with a cam groove, and operative connections between the rotary cam and tack pulling tool, substantially as described.

6. A tack pulling machine having, in combination, a pair of cooperating tack pulling jaws, a slide supporting each of the jaws, an actuating cam connected to the slides to impart advancing and retracting movements to the jaws, and connections between the cam and one of the jaws to move it toward and form the second jaw, substantially as de- Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

